I think this is a possibility, and I think this could be a reasonable assumption, but only under an entirely different fact pattern.
Why do I say this?
Well, there is substantial evidence indicating that this was not Trump's main concern and that he did, in fact, have a corrupt intent when he attempted to obstruct or end the Mueller investigation.
Mueller's report in Volume 2 revealed:
1. Trump was concerned about the public's perception of allegations of Russian interference and how that might cast doubt on the legitimacy of his election. (See page 89 of Volume 2)
2. Trump was concerned about how a criminal investigation into his own conduct and his campaign's conduct would become the subject of widespread media attention. (See page 97 of Volume 2)
3. Trump sought to persuade McGahn to lie about Trump's attempts to interfere in the investigation. You don't try to convince people to lie about your attempt to end an investigation if you are ending that investigation for legal and legitimate reasons. You try to convince people to lie if you're trying to cover up an attempted act of obstruction. (See page 120 of Volume 2)
4. Trump also dangled the prospect of a pardon in front of Manafort in order to discourage him from cooperating with investigators. If you have a legitimate reason for ending an investigation into yourself you don't need to dangle pardons in front of anyone to discourage them from cooperating in criminal investigations. (See page 132 of Volume 2)
All of these things are not legitimate reasons to end a criminal investigation, all of these things are corrupt reasons to end an investigation. And these are corrupt reasons EVEN if you are sympathetic to the idea of a person not wanting to experience public humiliation, and EVEN if you are sympathetic to the person who is experiencing such public humiliation.
And these intentions, if proven true, would lead to a successful conviction on obstruction EVEN if prosecutors could never prove an underlying crime.
And the SAME thing holds true with respect to impeachment and removal of a President on the basis of impeachment because an act of attempted obstruction is also an abuse of office.